Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o estilo da dança coreografada por Nacho Pop com resultado seguro?
 ###Tabelas: CREATE TABLE week_1_17_february_2008 (week_1_17_february_2008_id AUTO_INCREMENT PRIMARY KEY, Couple VARCHAR, Style VARCHAR, Music VARCHAR, Choreographer VARCHAR, Results VARCHAR) CREATE TABLE wilderness_years_1888–1893 (wilderness_years_1888–1893_id AUTO_INCREMENT PRIMARY KEY, Season INT, Pl INT, W INT, L INT, D INT, Captain VARCHAR, Most runs VARCHAR, Most Wkts VARCHAR, Wkt Keeper VARCHAR) CREATE TABLE notable_masters (notable_masters_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Employed VARCHAR, Position held VARCHAR, Honour VARCHAR, Citation VARCHAR) CREATE TABLE 1954_to_1972 (1954_to_1972_id AUTO_INCREMENT PRIMARY KEY, Issued INT, Type VARCHAR, Design VARCHAR, Serial format VARCHAR, Serials issued VARCHAR) CREATE TABLE overall_stats (overall_stats_id AUTO_INCREMENT PRIMARY KEY, Series VARCHAR, Seasons INT, Races INT, Poles INT, Wins INT, Podiums (Non-win) INT, Point Finishes (Non-podium) INT, Teams INT, Total Points INT, Championships INT, Best Finish (Championship) VARCHAR)  
SELECT Style FROM week_1_17_february_2008 WHERE Results = safe AND Choreographer = nacho pop